Fujitsu Siemens Computers pmn User Manual page 80

Reorganization
When the percentage of valid data on a physical volume which is in write status and is
not currently mounted in a Physical Device Service is below this limit value and at the
same time a reorganization is in progress because a scratch tape limit value has been
fallen below, this physical volume is placed in read status, and it is therefore a candidate
for reorganization.
Default:
Parallel Request Number
When a PV is reorganized, a movement request for each logical volume of this physical
volume is sent to the VLM. The parameter defines the number of such movement
requests which can be processed in parallel.
The value specified may not be too high for the following reasons:
–
–
Default:
Move Cancel Time
The PLM monitors the progress of the reorganization of a physical volume. This value,
specified in seconds, is used for this purpose.
If the status of the reorganization of a physical volume remains unchanged for this pe-
riod, the reorganization of this physical volume is aborted and, if applicable, the next vo-
lume is reorganized.
The timer is reset for each of the individual steps listed in the
ganization performed?" on page
Default:
Write Throughput
This parameter specifies the estimated write performance, in MiB/s, for reorganization
of a physical volume. It plays a part in determining the physical volume for which the
shortest reorganization time is to be expected (see
selected for reorganization?" on page
Default:
Write Overhead
This parameter specifies the estimated overhead, in seconds, for each logical volume
which is to be written. It plays a part in determining the physical volume for which the
shortest reorganization time is to be expected (see
selected for reorganization?" on page
Default:
80
70
Space must be created in the TVC for each logical volume which is to be read in,
i.e. under certain circumstances other logical volumes are displaced unnecessarily.
The VLM limits the number of logical volumes for reorganization per cache. When
this value is reached, subsequent "Move" requests must wait.
5
1800
5
3
Selected system administrator activities
75.
section "Which physical volume is
76).
section "Which physical volume is
76).
section "When is a reor-
U41117-J-Z125-7-76